Weird dots all over my engraving

[ednisley]

@Camlaser

find the solution about the weird dots on the engraving

Not a solution, but an explanation based on measurements:

Where Those Random Dots in Engravings Come From

It seems everybody engraving acrylic with a CO₂ laser has seen random speckles appearing in places where the design shows a blank. Regardless of the suggested remedy in the many threads on this topic, nothing stops the dots. It turns out the problem lies inside the high-voltage laser power supply, which occasionally fires the tube at random, even though the controller has disabled the supply’s output. Although I’ve measured only two power supplies, other folks report random dots regardless of t…

TL;DR: the HV power supply occasionally burps out a random pulse that fires the laser tube, despite being disabled by its L-ON input signal.

Although I saw this on only two power supplies, the symptoms seem common to all of them, if only because all CO₂ HV power supplies are pretty much the same inside.